A081496 - cp's OEIS frontend

A081496 Start with Pascal's triangle; a(n) is the sum of the numbers on the periphery of the n-th central rhombus containing exactly 4 numbers.

n	a(n)
1	5
2	14
3	46
4	160
5	574
6	2100
7	7788
8	29172
9	110110
10	418132
11	1595620
12	6113744
13	23505356
14	90633800
15	350351640
16	1357278300
17	5268292830
18	20483876820
19	79765662900
20	311038321440
21	1214362277700
22	4746455801880
23	18570960418920
24	72728638093800

[5, 14, 46, 160, 574, 2100, 7788, 29172, 110110, 418132, 1595620, 6113744, 23505356, 90633800, 350351640, 1357278300, 5268292830, 20483876820, 79765662900, 311038321440, 1214362277700, 4746455801880, 18570960418920, 72728638093800]

cp's OEIS Frontend

A081496 Start with Pascal's triangle; a(n) is the sum of the numbers on the periphery of the n-th central rhombus containing exactly 4 numbers.

Table of values

List of values