A384136
a(n) = (3*n)!/(2*n)! * Sum_{k=1..n} 1/(2*n+k).
Original entry on oeis.org
1, 11, 191, 4578, 140274, 5238132, 230784840, 11720201616, 674092013040, 43310839531680, 3074579815271040, 238983481496188800, 20187063842072319360, 1841332369689189619200, 180372122189263722009600, 18885338733119777188300800, 2104722524872544008142592000
Offset: 1
-
a(n) = sum(k=0, n, k*(2*n+1)^(k-1)*abs(stirling(n, k, 1)));
A384171
a(n) = 2^n * n! * binomial(5*n/2,n) * Sum_{k=1..n} 1/(3*n+2*k).
Original entry on oeis.org
1, 18, 503, 19312, 946009, 56419200, 3967700295, 321506211840, 29497821190065, 3022798062551040, 342204383046633975, 42414460290839347200, 5712600791700063700425, 830773593435129407078400, 129744737403826992957167175, 21657021896289762215460864000, 3847769544999445159548440534625
Offset: 1
-
a(n) = sum(k=0, n, k*(3*n+2)^(k-1)*2^(n-k)*abs(stirling(n, k, 1)));
A384172
a(n) = 4^n * n! * binomial(7*n/4,n) * Sum_{k=1..n} 1/(3*n+4*k).
Original entry on oeis.org
1, 24, 851, 40832, 2483269, 183241728, 15912395295, 1590131687424, 179766351690345, 22685041361848320, 3161081216499580395, 482101740659382681600, 79876921394710650447405, 14287114673531430042009600, 2743817201103924825303993975, 563131793021994402478188134400
Offset: 1
-
a(n) = sum(k=0, n, k*(3*n+4)^(k-1)*4^(n-k)*abs(stirling(n, k, 1)));
Showing 1-3 of 3 results.