A026971
Self-convolution of array T given by A026648.
Original entry on oeis.org
1, 2, 11, 34, 138, 492, 2342, 8500, 39814, 148124, 709266, 2665932, 12824196, 48623448, 235400988, 897705096, 4362689862, 16713200556, 81488683874, 313281535180, 1531312911148, 5903966489576, 28918583700468, 111757786454424, 548352142452124, 2123323536391448
Offset: 0
A026972
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026648.
Original entry on oeis.org
1, 6, 24, 108, 406, 1908, 7289, 34248, 131766, 623700, 2416836, 11487528, 44745468, 213451560, 834897375, 3993910416, 15673923910, 75152083716, 295737641768, 1420670333640, 5603322265428, 26960309526744, 106539505068194, 513309625743600, 2031786103702780, 9800639852315208
Offset: 1
A026973
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026648.
Original entry on oeis.org
1, 8, 52, 224, 1131, 4620, 23456, 92752, 460170, 1805760, 8946216, 34942176, 172593267, 673129380, 3323413216, 12954246368, 63944790462, 249263001360, 1230668687000, 4798770328960, 23700302314238, 92457112946968, 456814709763456, 1782991313610720, 8813232700137268
Offset: 2
A026974
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026648.
Original entry on oeis.org
1, 12, 77, 450, 2154, 11592, 51060, 261720, 1106790, 5562216, 23051943, 114491286, 468950860, 2313509520, 9409147640, 46221336720, 187136146566, 916762621320, 3700703183930, 18096198791748, 72903667955404, 356052268340208, 1432473805470840, 6990085402419600, 28096469154731484
Offset: 3
A026975
a(n) = Sum_{k=0..n} (k+1) * A026648(n,k).
Original entry on oeis.org
1, 3, 10, 25, 66, 154, 392, 882, 2180, 4796, 11640, 25220, 60424, 129480, 307264, 652936, 1538064, 3247024, 7604000, 15968400, 37217312, 77818016, 180652416, 376359200, 870795328, 1808574912, 4172640640, 8643327040
Offset: 0