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A015220 Even tetrahedral numbers. 1
4, 10, 20, 56, 84, 120, 220, 286, 364, 560, 680, 816, 1140, 1330, 1540, 2024, 2300, 2600, 3276, 3654, 4060, 4960, 5456, 5984, 7140, 7770, 8436, 9880, 10660, 11480, 13244, 14190, 15180, 17296, 18424, 19600, 22100, 23426, 24804, 27720, 29260 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

CROSSREFS

Cf. A000292.

Sequence in context: A020149 A056412 A032275 * A047199 A038065 A038422

Adjacent sequences:  A015217 A015218 A015219 * A015221 A015222 A015223

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian (ma3(AT)evansville.edu)

EXTENSIONS

More terms from Erich Friedman (erich.friedman(AT)stetson.edu).

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Last modified February 16 13:30 EST 2012. Contains 205909 sequences.