A346374 - cp's OEIS frontend

A346374 a(n) = f(n,n) where f(0,n) = f(n,0) = n! and f(m,n) = f(m-1,n) + f(m,n-1) + f(m-1,n-1).

n	a(n)
0	1
1	3
2	15
3	85
4	511
5	3221
6	21339
7	149969
8	1133215
9	9343525
10	85089883
11	860979329
12	9665236335
13	119534610885
14	1613648163963
15	23564301925713
16	369437215969599
17	6180713141601765
18	109812899448776475
19	2063836219057694753
20	40894619124091715983
21	851891564231714448133

[1, 3, 15, 85, 511, 3221, 21339, 149969, 1133215, 9343525, 85089883, 860979329, 9665236335, 119534610885, 1613648163963, 23564301925713, 369437215969599, 6180713141601765, 109812899448776475, 2063836219057694753, 40894619124091715983, 851891564231714448133]

cp's OEIS Frontend

A346374 a(n) = f(n,n) where f(0,n) = f(n,0) = n! and f(m,n) = f(m-1,n) + f(m,n-1) + f(m-1,n-1).

Table of values

List of values