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A149418 as a simple table

n a(n)
0 1
1 1
2 4
3 12
4 55
5 184
6 879
7 3283
8 15929
9 62222
10 305006
11 1233715
12 6081876
13 25181122
14 124578183
15 524939078
16 2603359344
17 11120535185
18 55244397220
19 238564600702
20 1186615992619
21 5170229157814
22 25740573127296
23 112994182925001
24 562957176960359
25 2486929397436891
26 12397280542469366
27 55065536289042493

[1,1,4,12,55,184,879,3283,15929,62222,305006,
 1233715,6081876,25181122,124578183,524939078,
 2603359344,11120535185,55244397220,238564600702,
 1186615992619,5170229157814,25740573127296,
 112994182925001,562957176960359,2486929397436891,
 12397280542469366,55065536289042493]

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Last modified February 29 07:00 EST 2024. Contains 370414 sequences. (Running on oeis4.)