Skip to main content
0
Search products
Search
Mugs
Tees
Hoodies
Search products
Search
Chat
Share
Free Shipping
Menu
Mugs
Tees
Hoodies
Back to urbandictionary.com
Pro Customization
Create unique products with your own words and definitions
Preview
Personalize Your Design
Your Word
Your Definition
You wrote letters on the keyboard in [tetrahedral] sequence. This is 274th level of boredom. First sequence is just ones : 1 1 1 1 1 1... Second sequence is natural numbers : 1 2 3 4 5 6. You make next number by adding 1 Third sequence is triangular numbers : 1 3 6 10 15 21. You make nth number by adding n Fourth sequence is [tetrahedral] numbers : 1 4 10 20 35 56. You make nth number by adding nth number from the previous sequence. Same for next sequences. And for previous. You can find these sequences in Pascal's triangle and in (a+b) [to the power of] n.
Text fits
Save
Cancel
🤖
Shopping Assistant
Online
Hey! 👋 I'm your shopping assistant. What are you looking for?
Ask about products
AI-generated responses. Verify claims.